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May 2011
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A silicon carbide ceramic mechanical seal is promising longer life for demanding pump applications.
 Dr Bob Oscroft, product development engineer at Morgan Technical Ceramics, says it will enable plant engineers to improve pump reliability, meaning less downtime and reduced operational costs.
He points out that mechanical seals are designed to trap a thin film of liquid, which acts as a lubricant as well as a seal – but that, occasionally, pumps continue to run when there is no fluid, leading to increased friction and high temperatures.
As a result, standard O-ring seals degrade and, when the fluid starts circulating, the seals leak.
However, Oscroft says that his firm's new material exhibits excellent resistance to abrasion, low thermal expansion coefficient and outstanding thermal shock resistance.
"Our seals offer exceptional dry running performance, which means they are less likely to fail, thereby reducing leakage and process downtime," claims Oscroft.
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Author
Brian Tinham
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